The Kramer VS-41 AV 4x1 Composite Video & Stereo Audio Mechanical Switcher is an outstanding mechanical switcher which can be operated without a power source. The mechanical/passive switching technology enables the unit to perform smoothly when switching any of the 4 composite video or unbalanced stereo audio signals to a single output. The Kramer VS-41 AV 4x1 Composite Video & Stereo Audio Mechanical Switcher also offers a high bandwidth of 520MHZ (-3db). The device is a space saver as the 2 compact size units can be mounted side by side in a 1 U rack with the optional RK-81 adapter. Experience a new level of independent video and stereo audio switching with the Kramer VS-41 AV 4x1 Composite Video & Stereo Audio Mechanical Switcher.